Corrugator roll mounting



Oct. 18, 1955 L. ROCKSTROM ETAL CORRUGATOR ROLL MOUNTING 8 Sheets-Sheet 2 Filed March 8, 1952 1 INVENTORS c/rJ' from 02 r cZ ZU/V/I'Q'IM A cZware? (ffnolrcx ATTORNEY Oct. 18, 1955 L. ROCKSTROM ETAL' CORRUGATOR ROLL MOUNTING 8 Sheets-Sheet 3 Filed March 8, 1952 INVENTORS Foc/ps'from,

Leona-rel warez and LUV/Ham Edward kgp ndra Cl-r f ovngy Oct. 18, 1955 1.. ROCKSTROM ET AL 2,720,910

CORRUGATOR ROLL MOUNTING Filed March 8, 1952 8 Sheets-Sheet 4 INVENTORS. Lgqnczrc? ocksvrom, UUV/ham l. ZU rd and clwcn-d (/01 Ya.

I?! affern y Oct. 18, 1955 RQCKSTROM ETAL 2,720,910

CORRUGATOR ROLL MOUNTING 8 Sheets-Sheet 6 Filed March 8, 1952 F/Q, l5,

INVENTORS ATTORNEY Oct. 18, 1955 ROCKSTROM ErAL 2,

CORRUGATOR ROLL MOUNTING L Filed March 8, 1952 8 Sheets-Sheet 5 INVENTORJ.

Leonard Foo/ 8751:),

CU/g g?! izwcvrccuvcz worr- IH 700 [SS/W f Oct. 18, 955 1... ROCKSTROM ETAL 2,720,910

CORRUGATOR ROLL MOUNTING Filed March 8, 1952 8 Sheets-Sheet 8 C7 INVENTORS L eoncrr Too/4x97 70177 ZU'H/fanv F, w 7-0. an

ATTORNEY United States Patent CORRUGATOR ROLL MOUNTING of Maryland Application March 8, 1952, Serial N 275,652

13 Claims. (Cl. 154-31) This invention relates to improvements in a corrugating machine for making single faced corrugated board from paper stock. In the making of such single faced board, paper stock is passed between two fluted or corrugated rolls, the paper having been moistened and the rolls heated and the fluted rolls are pressed together with considerable force as the paper stock passes between them to be corrugated. The corrugated paper, still on the roll, then has adhesive applied to the corrugations on the outside and another sheet called a face or liner is applied to the adhesive side of the corrugated paper, also under considerable pressure, to make what is known as single faced board.

The board as it passes between the corrugating rolls aries considerably in thickness with the quality of the :.tock and it also varies considerably in stiffness so that nore or less pressure may be required between the rolls to give the paper the desired fluting or depth of corrugation without breaking the paper at the bends forming the corrugations. Also diiferent widths of stock require different pressures between the rolls.

corrugating rolls are now made so long that they almost invariably bend longitudinally under the pressure to which they are subjected. The lower roll is usually cut straight, with parallel sides and the upper roll is usually cut with a crown, or barrel shape so that when pressure is applied at the ends of the upper roll, the face of the roll in contact with the lower roll comes down parallel. If the pressure between the rolls is too little the sides of the board will not be corrugated as deeply as the center and with too much pressure the sides of the board will be corrugated more deeply than the center.

The pressure between the lower corrugating roll and the pressure roll, the pressure roll applying the liner to the corrugated board while it remains on the lower corrugating roll, after having adhesive applied to it, is also critical. This roll is also cut with a larger diameter in the center, or barrel shape and variations in the thickness of the stock have generally been provided for by mounting the pressure roll on eccentric bearings, which could be adjusted for diflerent thicknesses of liner stock.

Although springs have sometimes been proposed to apply pressure to the pressure roll as well as the upper corrugating roll, springs lose their power to exert the same force over a period of time. Also it is nearly impossible to obtain two springs, one for each end of the roll, which will apply equal pressure to both ends of the roll and as a consequence one side of the board will often be fluted with deeper valleys than the other or one side will have the liner firmly glued to the board and not so firmly glued on the other side. -Springs also have a period of vibration and that period varies with their age and use. The flutes in the corrugating rolls tend to set up a vibration between the upper corrugating roll and also the pressure roll. The springs which have heretofore been used are intended to absorb this vibration and yet maintain the rolls in fluting relation as well as liner pressure applying relation. When the corrugator has been run slowly this 2,720,910 Patented Oct. 18, 1955 vibration against the springs has not had serious consequences but as the rolls have been run faster to produce more feet of corrugated board per minute, the period of vibration of the springs has sometimes equalled the period of vibration of the rolls so that the fluting takes place erratically and also the adhesion of the liner to the corrugated board has been uneven, and quite unsatisfactory board has been turned out by these increases of speed on the old machines.

The stock for corrugating is drawn from a large supply roll and it has been the practice to draw it by the corrugating rolls themselves so that the speed of the corrugating rolls determines the speed of the unwinding from the supply rolls. Various tension applying devices have been used in an elfort to regulate the tension on the stock between the supply roll and thecorrugating rolls. It has been found in practice, however, that the supply roll is not always round and the tension applying devices consequently are unable to keep the tension uniform on the stock as it enters the corrugating rolls. This variation of tension has often caused the upper or movable corrugating roll to swing up and down as the tension on the stock varies and to consequently varythe depth of the corrugations in the stock as it passes between the two corrugating rolls. Sometimes this variation of tension of courseris at one edge of the stock and sometimes at the other and even sometimes at the center so that the variations in the corrugations become quite marked.

One of the objects of the present invention is to so mount the upper corrugating roll that any variation of tension on the stock as it is pulled from the supply roll by the corrugating rolls will tend to draw the rolls together at all times rather than apart. Another object of the invention is to place stops to positively limit the movements of the corrugating rolls together. Another object of the invention is to mount chambers and pistons with fluid pressure applying means in the chambers to accurately apply pressure to the upper corrugating roll at each end separately and similarly to apply pressure to each end of the pressure roll as it presses the liner against the corrugating board on the lower corrugating roll. These fluid pressure chambers for each respective roll are interconnected so that the pressure can be applied equally to each end of the respective roll and gages are placed in the pressure lines so that the precise pressure on each end of each roll will always be apparent and so that it can be varied at will. Adjustable stops are also provided between the lower corrugating roll and the pressure roll, so that undue pressure can never be applied to the pressure roll.

These positive controls of the pressure between the corrugating rolls and the pressure roll and the lower corrugating roll produce much more uniform single faced board at a much greater number of feet per minute than has been possible by machines heretofore used. They also evenly distribute the wear over the length of the rolls, also the machine is out of use for adjustment for shorter periods of time.

Other objects and advantages together with other improvements in the corrugator will be apparent from the following description and the accompanying drawings forming a part hereof and in which:

Figure 1 is an elevation of the operating or right side of the machine.

Figure 2 is a front elevation partly in section on line 2-2 of Figure 1, and partly broken away of the upper or movable corrugating roll.

Figure 3 is a side elevation of the swivel arm of the upper roll.

Figure 4 is a front elevation of the swivel arm.

Figure 5 is a sectional view through the bearings of the corrugating and pressure rolls on the left or drive side.

of Figure 8.

' rolls befor 'ing r 114 and the s" ila'rly pivoted ligure 6 is a on the right or operating side.

pe se w fins 9 e e n -.1

ure is. a sir iilar; f

t. "l wie .;o lni i i i roll showing the longitu mal ad usting "mechanism for thisroll V A I I Figure 9 'is a fragmentary sectional view on 'lin'e 9- 9 Figur e is a fragmentary sectional view showiiig the pin "for 'ixiounting 'the swivel arm of the upper corrugating foll.

. owing'a'cir'cuit for hydraulic chambers ior ap mg the pressure. p v a 4 "Figure showsin die amfifrm the -relation 'of'the pressureis applied betweedthm. I I

' i i i ef i n r vafte P e s rf k iii dJ Similar numerals refer to similar parts throughout the several views V each side removable caps 2 applied onjits front and 1 'whichi'are mounted a vertically stationary lower corru- V gating roll 3" and anfupper 'vertically movable corrugatvertically movable pressure roll 5. V

V The upper roll 4 is :r n o unted; on two swivel arms 6 7 a ofrwhich i s i vt a ti 'b 'th rii Gi i 'bea 'ing9 of one of the ea ps2. pressure roll Sis likewise mounted in two 1D eiachof wh ich is t llinj'b earing 12 o f the frame 1.

' a hj s l n d. it b te fli 1. 9 i ma n:

s nedf t bs i si qs qn Ytm a Lt t bolts 13 Pe a nflyat a bsP n we F. :14 wh h is h ld an each yoked swivel armli by me s vof bolts 15. Cap 14 has other h les 16 th erethroii gh 1 5 so 7 that 'when thes e bolts lf5fare' r emoyed romitheir holding position, to hold the pin 'in place; in the 'seige arm, these 6 B 5 may. qi s tl n z s 16 i fimtfi in nst sm against the si deof the arm p ul ls the from bearing. The forks of each swivel arm 6 straddle "the upper ends of each bearing cap 2 and betweenthe i Y i V T 'c i q etort n b i es 'f e 1 rms 9 Figure 7 is a sectional view of the right end of the r end h arbloc 17 are placed and rest on oneside against stop bolts on the bearing caps 2 and ares pressed on weat e side by'the ends; '19 .of the pist ns fiflmounted in ch h efs 21 Chambers 21 are mounted on brackets b d d iis -f a, a i .7 6 t. 't

swears lit resent n we e arms of yokes 23 attached to the lower ends of bearna aps Ths es el ar s. av m ar. s p b l 7 24 bearing upon stops 25 on yokes 23. The pressure roll 5 is similarly heldby pistons. 26 in chambers 27 against 7 a the lower 'corfugating roll 3. Figure 11 shows one bear-.

ing cap 2 with its'accompanying chambers attached, both before and'after the bearing cap isatt'ached to the side of themainfram'e 1. r Y I r The three rolls 4, 3 and 5. are 'li ollo'w'asfshown Figures 5 and 6 and ste aui is jadmitted toihese' rolls through-pipes so which rotate with the'toll'shI ld which are mounted in"'ch ambf ers 31 which aredieldistatioriary.

Condensate is withdrawn follsthroug'h'pipes '32. The three rolls are manned at each end :diiiible conical roller bearings 33, the cages 34 oftwliich htave n 1 5 5 -lji ss 3&5 the oil lis maiutined the bearings by seals" 7 is thusikept contan y r su a aa hr ug ttopen n fi .i h ,1 e connected with the bearings around the endsfof each roll. It has heretofore been customary to mount these rolls on relatively longrshaits, mou ting themonshort shafts'with constantly lubricated bearings has greatly in- 4,. creased the speed at which the rolls may be run and yet maintain'accurate pressure between them.

The center roll may be adjusted longitudinally by 7 means of an endwise adjustment ring 40 keyed to ring 41 mounted fast on frame 1, ring 41 having spaced openings 42 therein at different positions of the circumference of the ring 41 to receive thespring held pin 43 e The bearing cage 44 at this end of the lower corrugating roll has a pressure fit with sleeve 45 attached by bolts 46 to bearing retainer 47. key 48 is attached to theffr arjne 1 and slides in way 49 on the oil seal fcap 50 "bol tedto the sleeve "45. This key prevents relative rotation between the bearing retainer 47 and frame 1.

Pressure is applied to the chambers"21 'andl27 in the V preferred pneumatic form by means of pressure received a from a source not shownand through "lines 51 where the pressure for both chambers 21 is adjusted by means of valve 52 and separately for the chambers 21 by means of valves 53. g The pressure for each chamber 21 has a separate pressure gage 54. V V V V For the chambers 27 air is'admitted through line 55 and the initial adjustment is likewise madeby a valve 56 and individual regulation for chambers 27 is made 7 through valves 57. These two chambers likewise have in dividual pressure gages 58; Through means of these "lines the pressure on each two chambers, on each roll, is adjusted together equally and if individual adjustment be required for each chamber that can be done by the separate valves.

Should it be desired to use liquid instead of air'to regu- 69 and from these valves therpressure goes to the top of f the cylinders for both rolls to press them against the lower corrugating roll, there being a pressure gage 70 separately foreach roll, a drain 71 is connected to the bottom of the pressure cylinders 60 and 62 to carry the liquid back to the source, a return line '72 likewise returns the liquid when th' e'rqlls are to be released from pressure holding position.

Although not forming a part of this invention, adhesive,

is supplied'to the crowns of the corrugated board on roll 3 by means of a pick up roll 76 and an applicator roll 77 both of which are mounted in a frame 78 which is mounted inside the main frame 1 on two rear arms 79 and two for-V ward arms :80, the upper ends of arms 80 being on a shaft common with gear 81 which is rotated through means of a worm by crank 82 to swing the adhesive rolls backwardlout of adhesive applying position.

The glue pan 8 3 is likewise mounted on four arms 84- and it may likewise be swung backward by a handle, not

shown.

The lower corrugating'roll is driven by a motor through V a belt 85, driving a gear 86 which drives the lower roll,

the upper corrugating roll is driven through the inter- V meshing of the corrugations with thelower roll. The glue rolls are driven from the same motor by means of belt 87 or bymeans of an independent'motor88,tthe independent motor is so geared as to operate constantly but by means of a slip 'clutchnot to drive while the maindrive is in operation. When the main drive is cut off, the slip clutch allows the smaller motor 88 to drive the glue rolls at a slower speed. The pressure roll is driven by a separate motor 90 through a gear reduction mechanism 91 andgears92, H} or 7 7 Stock to be corrugatedis brought in from thejba'ck of thecorrugator through tensioning mechani'sm 93, over hei gnw .mew a 'w w th t of 11 u er amb e qo ms q q lfl i'e lin r ta s aimed to thefcorrugated stock is brought infrom the front of the machine and passes around rolls 96, 97 and 98 to the underside of the pressure roll 5.

After the crowns of the stock on corrugator roll 3 have received their adhesive from applicator roll 77, the liner on pressure roll 5 is pressed firmly against the adhesive and since these rolls are all heated, the adhesive sets and the single faced corrugated board is carried out from between the lower corrugator roll 3 and the pressure roll 5 under the guide roll 99 and upwardly over the machine.

From the above detailed description it will be apparent that the pressure roll and the upper corrugating roll which are barrel shaped as shown by the indicated lines in Figure are pressed so that adjacent surface lines are parallel as shown in Figure 16 by means of the pressure applying pistons and chambers and the exact pressure required for the particular stock to obtain the best corrugating effect as well as the best adhesive adhering eflect may be obtained and any irregularities of the tension on the stock fed to the machine for corrugating draws the corrugating rolls together, rather than apart, but not so far together as to injure the board because of the stops 18 that limit the corrugator roll swivel in its movement downwardly.

It will be apparent that many changes may be made in the detailed construction of the corrugator of this invention without departing from the essential features thereof which are defined in the following claims.

What is claimed as new and is desired to be secured by Letters Patent is:

1. A machine for making single faced corrugated board comprising a pair of parallel axis revolvable fluted rolls normally disposed to intermesh the crowns and valleys of the two rolls, one roll being movable toward and from the other, a pair of spaced levers, fixed pivot means for said levers, said movable roll being journalled in said levers, pressure applying means including a fluid chamber and a fluid operated piston therein operatively attached to said movable roll, to urge it against the other roll, means to guide stock to be corrugated around the movable roll, the stock passing between the two rolls to corrugate the stock, said guiding means being positioned to bend the paper around the movable roll toward its axis away from a tangent through the axis of the fixed pivot means to the roll on the side opposite said other roll, whereby tension on the stock between the movable roll and guiding means forces the movable roll toward the other roll.

2. The machine of claim 1 including stops to limit the movement of the movable corrugating roll toward the other corrugating roll under the influence of the tension on the stock.

3. A machine for making single faced corrugated board comprising a pair of parallel axis revolvable fluted rolls normally disposed to intermesh the crowns and valleys of the two rolls, one roll being movable toward and from the other, a pair of spaced levers, fixed pivot means for one end of each of said levers, said movable roll being journalled in said levers intermediate the lever ends, the levers extending beyond two spaced sides of the roll, separate pressure applying means including a fluid chamber and a fluid operated piston therein operatively attached to said levers at their free ends, to urge the movable roll against the other roll, means to guide stock to be corrugated around the movable roll, the stock passing between the two rolls to corrugate the stock, said guiding means being positioned to bend the paper around the movable roll toward its axis away from a tangent through the axis of the fixed pivot means to the roll on the side opposite said other roll, whereby tension on the stock between the movable roll and guiding means forces the movable roll toward the other roll.

4. The machine of claim 3 including stops to limit the movement of the movable corrugating roll toward the other corrugating roll under the influence of the pressure applying means and the tension on the stock.

5. A machine for making single faced corrugated board comprising" a pair of parallel axis revolvable fluted rolls normally disposed to intermesh the crowns and valleys of the two rolls, a liner applying pressure roll parallel to and adjacent one of said fluted rolls the pressure roll tending to be vibrated by the spaced crowns of the adjacent fluted roll, a pair of spaced levers, fixed pivot means for one end of said levers, said pressure roll being journalled in said levers intermediate the lever ends, the levers extending beyond both sides of the roll, separate positive pressure applying means including a fluid chamber and a fluid operated piston therein operatively attached to said levers at their free ends, whereby pressure applied to the levers urges the pressure roll toward its adjacent fluted roll and dampens the vibrating of the pressure roll, adjusting means common to said pressure applying means for balancing their pressure equally, simultaneously.

6. A machine for making single faced corrugated board comprising a pair of parallel axis revolvable fluted rolls normally disposed to intermesh the crowns and valleys of the two rolls, one roll being movable toward and from the other, a liner applying pressure roll parallel to and adjacent said other fluted roll in operation the movable roll and pressure roll tending to be vibrated by the spaced crowns of the adjacent fluted roll, two pairs of spaced levers, fixed pivot means for one end of said levers, said movable roll and said pressure roll each being journalled in a pair of said levers intermediate the lever ends, the levers extending beyond both sides of the rolls, separate positive pressure applying means including a fluid chamber and a fluid operated piston therein operatively attached to said levers at their free ends, whereby pressure applied to the levers urges the lever supported rolls toward said other fluted roll and dampens the vibrating of the lever supported rolls, adjusting means common to said pressure applying means for each pair of levers for balancing the pressure of each pair separately, equally, simultaneously.

7. A machine for making single faced corrugated board comprising a pair of parallel axis revolvable fluted rolls normally disposed to intermesh the crowns and valleys of the two rolls, a liner applying pressure roll parallel to and adjacent one of said fluted rolls the pressure roll tending to be vibrated by the spaced crowns of the adjacent fluted roll, a pair of spaced levers, fixed pivot means for one end of each of said levers, said pressure roll being journalled in said levers and spaced from said pivot means of each lever, a fluid chamber and a fluid operated piston therein operatively connected to each said lever adjacent its free end to apply pressure to said levers whereby the pressure applied to the levers urges the pressure roll toward its adjacent fluted roll and dampens the vibrating of the pressure roll, adjusting means common to said fluid chambers to adjust their pressure on said pressure roll through said levers simultaneously.

8. A machine for making single faced corrugated board comprising a pair of parallel axis revolvable fluted rolls normally disposed to intermesh the crowns and valleys of the two rolls, a liner applying pressure roll parallel to and adjacent one of said fluted rolls the pressure roll tending to be vibrated by the spaced crowns of the adjacent fluted roll, a pair of spaced levers, fixed pivot means for one end of each of said levers, said pressure roll being journalled in said levers and spaced from said pivot means of each lever, a fluid chamber and a fluid operated piston therein operatively connected to each said lever adjacent its free end, and supports for said chambers and pistons located on the side of the pressure roll opposite the adjacent fluted roll, adjusting means common to said fluid chambers to move the pressure roll toward the adjacent fluted roll, through said levers, simultaneously to circumferentially equalize the pressure between the pressure roll and the adjacent fluted roll.

9. A machine for making single faced corrugated board comprising a pair of parallel axis revolvable fluted rolls normally disposed to intermesh the crowns and valleys of the two rolls, a liner applying pressure roll parallel to and adjacent one. of said fluted rolls the pressure roll tending to be vibrated by the spaced crowns of the adjacent fluted roll, 'a pair. of spaced adjustable pressure applying elementsffors'aid pressure roll, to adjust itsp'ressure against a the adjacentjiuted roll, each of said adjusting elements including a fluid chamber and a fluid operated piston therein operatively conhected to move the pressure roll and means connectediin common to said chambers to adjust the adjusting elements simultaneously to circurn-V fereritiallyt equalize the pressure between 'the pressure roll and the adjacent fluted roll.. t

10. A machine for making single faced corrugated board comprising a frame, a pair of meshing corrugating rolls and a liner 'app'lyingpressure roll mounted in'the frame, the pressurerrollbeing' adjacent onerof said fluted rolls the pressure rolltendingito ibe vibrated by the spaced crown'si of the adjacent fluted roll,..a' pair. of levers each having ZOfiC end pivotally. mounted. in the frame and forming the support in thelframe for the pressure roll, the pressure roll being journalled in the levers intermediate the ends thereof, chambers having fluid operated-pistons therein mounted between the frame 'and 'the free ends 'of the. levers and means common/to the chambers .to admit fluid pressure to the chambers simultaneously toforce the pressure roll againsttits adjacent corrugating 'roll to circumferentiallyequalize the-pressure between the pressure roll and the adjacent fluted r011.

ll. A machine 'for making'singl'e faced corrugated board comprising a'frame, a corrugating roll mounted in fixed position 'in the frame,'spaced levers each pivoted at one end in tthe'fir'ame a' movable corrugating roll journalled in said levers, pressure applying means including a fluid chamber anda fluid operated piston the'reinoperatively* attached to said movable roll to ifiterm'esh the crowns and valleys of the two rolls,'rneai1s to :guide stock ;to be corrugated around the movable 'rolljmeans to place 12- I1 machin of l m 11 n .1 ing wi i iimirj the movement of the movable corrugating roll under the influence of the pressure applying means and the tension onithe stock board comprisinga frame, a -pair of; mes hing corrugating l rm un edin th fl ra n n r ot' crs ea h havi ie en p v a lyrmmmt s th c i e and. ro i s h support in the frame for one of said rolls,' the1 evermounted 101 e n 'iqum lled n t l v intermediate. th n h e f, a hi v ti s tr ee d c p in a fork, o

har .9 1 ea h; s e o' the ra e. p ra ip P essu e appl i g msansf sn ding a rfl i ham r a r flu gl. opera ed p stonr he ei m n ed pq andeitendnshq wq u. t e aidiq ks. a thei f ee e ds u'ns against the frame to force the corrugating rolls into meshr ing relation. 7 

